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Date:      Thu, 3 Feb 2011 11:18:36 +0000 (UTC)
From:      "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
To:        Monthadar Al Jaberi <monthadar@gmail.com>
Cc:        FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org>
Subject:   Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE)
Message-ID:  <20110203111206.S80258@maildrop.int.zabbadoz.net>
In-Reply-To: <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com>
References:  <AANLkTik8D_bLwcUKZdBT-kpkJdDXtPTLvAqfUe0cLoSz@mail.gmail.com> <4D484213.6050100@freebsd.org> <AANLkTikJKZLQVA5X2PQs0oT4iFsZYBw7K07kjQTc9iGD@mail.gmail.com> <4D486108.5060805@freebsd.org> <AANLkTi=mk2vfyXJBaK5mV2sBWEj0-RDZneLs%2BXq_c7sb@mail.gmail.com> <20110202164827.I80258@maildrop.int.zabbadoz.net> <4D4994CE.2090209@freebsd.org> <AANLkTimDZRefv57_nanxGUbHjP1wqeQ41iWHvpXogmvU@mail.gmail.com> <4D49AB29.7070909@freebsd.org> <AANLkTinONnLE9D=c57nQmGBFbWJgqJmeKiRViW3gga2a@mail.gmail.com> <20110203095019.N80258@maildrop.int.zabbadoz.net> <AANLkTinY0AVSsEE5PZaJOqyuinsAN6wkUL9URAqYs0X4@mail.gmail.com> <20110203105747.K80258@maildrop.int.zabbadoz.net> <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com>

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On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:

> On Thu, Feb 3, 2011 at 11:59 AM, Bjoern A. Zeeb
> <bzeeb-lists@lists.zabbadoz.net> wrote:
>> On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote:
>>
>>>>>> I don't understand why you saw a CRED_TO_VNET of 0
>>>>>> I was under the impression that every process/thread in the system
>>>>>> would
>>>>>> be
>>>>>> on vnet0
>>>>>> in a vimage kernel.
>>>>>
>>>>> This is how my printf looks like:
>>>>> struct thread *td =3D curthread;
>>>>> struct vnet *v =3D TD_TO_VNET(td);
>>>>> struct ucred *cred =3D CRED_TO_VNET(td->ucred);
>>>>> struct vnet *td_vnet =3D td->td_vnet;
>>>>
>>>> here's your problem:
>>>>
>>>> strcut vnet *vnet =3D cred->cr_prison->pr_vnet;
>>>
>>> When I add CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); I get a pani=
c
>>> too...
>>> But your suggestion works if I do like this:
>>> curthread->td_vnet =3D curthread->td_ucred->cr_prison->pr_vnet;
>>>
>>> CRED_TO_VNET(curthread->td_ucred) returns NULL
>>
>> I wonder how you are building your module and if VIMAGE is properly
>> defined. =A0If it's not that would explain a lot of things.
>
> I have put options VIMAGE, rebuild both world and kernel.
>
> I can create jails with vnet options...
>
> I build my module with the standard Makefile for modules:
> ...
> KMOD    =3D  wtap
> ...
> SRCS    =3D  if_wtap_module.c if_wtap.c if_medium.c hal.c
>
> .include <bsd.kmod.mk>

Right but are you building your module along with the kernel or
outside the tree?  In the latter case you may want to add soemthing
like

SRCS+=3D          opt_global.h

=2Eif defined(KERNBUILDDIR)
MKDEP=3D          -include ${KERNBUILDDIR}/opt_global.h
=2Eelse
CFLAGS+=3D        -include opt_global.h
MKDEP=3D          -include opt_global.h

opt_global.h:
         echo "#define VIMAGE 1" > ${.TARGET}
=2Eendif

and/or point KERNBUILDDIR to where you built your kernels.


>>
>>
>>>>> printf("td=3D%p, td->td_vnet=3D%p, td->td_ucred=3D%p, TD_TO_VNET=3D%p=
,
>>>>> CRED_TO_VNET=3D%p\n", td, td_vnet, td->td_ucred, v, cred);
>>>>>
>>>>> I made a fast search in /usr/src for "td_vnet" and found it was
>>>>> assigned only in
>>>>> int fork1(td, flags, pages, procp):
>>>>> #ifdef VIMAGE
>>>>> =A0 =A0 =A0 =A0td2->td_vnet =3D NULL;
>>>>> =A0 =A0 =A0 =A0td2->td_vnet_lpush =3D NULL;
>>>>> #endif
>>>>
>>>> Nice try. =A0Want another search? =A0Hint: there is this in vnet.h:
>>>>
>>>> #define curvnet curthread->td_vnet
>>>>
>>>> And then you'll, again, find the CURVNET_SET_* macros.
>>>
>>> Thank you
>>
>> Something you may find useful as well btw is:
>>
>> http://people.freebsd.org/~bz/20100530-02.vnet.9.html
>
> weired compiler complains about that there is no <sys/vnet.h>, I
> include <net/vnet.h> maybe old documentation?

it's net/vnet.h.  Documentation bug from a local transisiton time to
the general framework.  Thanks for catching;)  net/vnet.h will
obviously stay.

--=20
Bjoern A. Zeeb                                 You have to have visions!
         <ks> Going to jail sucks -- <bz> All my daemons like it!
   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html
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